CONTENTS 



CHAPTER I. 



Page. 

 Form and Classification of Bacteria .... 15 



Definition of bacteria. Microscopic plants and animals, 



distinction. Bacteria as plants. Bacteria, fission fungi or 



schizomycetes; moulds, thread fungi or hyphomycetes; yeasts, 

 budding- fungi or blastomycetes. Absence of a natural classi- 

 fication. Bacteria classified according to form; micrococcus, 



bacillus, spirillum. Modifications; bacterium, vibrio, spiro- 



chaete. Division into species. Influence of environment on 



form and size. Involution forms. Variations due to meth- 

 ods of examination. Plasmolytic changes. Pleomorphism. 



Constancy of species. Attenuation. Origin of new spe- 

 cies. 



CHAPTER II. 



Size and Structure of the Bacterial Cell '. . . 24 



Bacteria as unicellular organisms. Called the smallest 



of living beings. Existence of still more minute life. 



Micromillimeter or micron. Size of bacteria. 



The cell-wall, composition, demonstration. Plasmolysis. 



Softening of the outer layer, the capsule. Zooglea. 



The contents of the cell, composition. Existence of a 



nucleus. Appearance of contents; granulations, polar bodies, 



color, absence of chlorophyll. Granulose reaction. 



Motility. Molecular or Brownian movement. Real 



motion, flagella or whips. Number and arrangement. 



Giant whips. 



CHAPTER III. 



The Life-history of Bacteria . . . V . 41 



Rapidity of multiplication. Cell division: diplo-bacillus, 



threads; diplococcus, streptococcus, tetrad, sarcine, staphylo- 

 coccus; vibrio, spirillum. 



